get the cars rear end off the ground and on jack stands by a few inches, then using a prybar or 2x4, pry on the tires against the ground or other stable points and see if you can spot any abnormal flexing or movement of the rear end. Jostle, jiggle and work your way the various parts, to be sure nothing is loose that shouldnt be...this is a quick dirty way to see if you have something not buttoned up or something internally going on. Could be a bad shock, loose suspension bolts, driveline, rear diff going out....
I once had a car that wouldnt stay aligned..after months of chasing it, turned out the entire front craddle was floating around (loose bolts)...ya just never know.
I once had a car that wouldnt stay aligned..after months of chasing it, turned out the entire front craddle was floating around (loose bolts)...ya just never know.
